江河源区近40年来气温变化特征的研究

Analyses on variety characteristics of temperature in Yellow River and Yazang sources in recent 40 years

通过对长江、黄河源区从1961-2001年的年平均气温、日最高气温、日最低气温随时间变化规律的分析得出:江河源区近40年来年平均气温、日最高气温、日最低气温随时间均呈增温态势;日最低气温的增温比日最高气温的增温更显著:20世纪90年代以来气温明显偏高;但也有新的特点:一月份日最高气温、日最低气温和日平均气温进入90年代不但没有变暖反而是降低的;80年代后期年平均气温、日最高气温、日最低气温发生了显著的变暖突变.

This paper is mainly studied temperature change on Yellow River and Yazang sources and analyzed the features of the daily minimum temperature as well as the daily maximum temperature and the daily minimum temperature in Yellow River and Yazang sources in 1961-2001.This paper has achieved some conclusions: the daily mean temperature ,the daily maximum temperature and the daily minimum temperature all increased in recent 40 years in this area. The increasing speed of daily minimum temperature is faster than that of the daily maximum temperature. The temperature in 1990s is apparently higher than that in the former period and the main new feature in 1990s is that the January daily maximum temperature, daily minimum temperature and daily mean temperature do not get warmer but colder. There is abrupt changes in the daily mean temperature ,the daily maximum temperature, the daily minimum temperature in 1980s.